A Towerful of Mice is the first side quest to the path of romancing Keira Metz in The Witcher 3. During the quest, Keira needs your help to lift the curse on Fyke Island.

A Towerful of Mice Walkthrough

Hop into Keira’s boat and sail to Fyke Island. Upon arriving, the island has Drowners, Ghouls, and Rotfiends. Clear them out and go tower marked on your mini map. Climb the stairs and begin your ghost busting investigation.

Make sure to equip the magic lamp from Keira and use it to find ghosts around. In total, there are eight places where you can use the magic lamp:

• Near the fast travel point (they talk about how wonderful the attack is going to be)
• South of the fast travel point. Towards the edge of the yellow search area on the map.
• On the northeast side of the main building (shows one of the peasants getting sick).
• Every floor, except the third, has a ghost or ghosts having a conversation.

You can check them out to earn extra EXP. Go from the basement up to the top floor, stopping to spy on specters. Once you reach the fourth floor, Keira will insist there is a laboratory on a fifth floor. Use your Witcher Senses to find a hidden lever to reveal the fifth floor.

In the lab, besides horrible tests on humans, you will find the source of the curse, a young woman named Anabelle. When talking with Anabelle you learn that she was presumed dead because of a heavy-duty sleeping potion. When she awoke, the rats ate her alive. A pretty gruesome death. You now have two options to complete the quest.

If you choose to fight Anabelle, here's what you need to know:

She’ll have one last favor to ask and it leads to romantic relations with her, so saddle up and take on the side quest “A Favor for a Friend.”